aioble/device.py: No default timeout for async disconnected() method.

The value for the `timeout_ms` optional argument to
`DeviceConnection.disconnected()` async method is changed from 60000 to
None. This way users awaiting a device disconnection using `await
connection.disconnected()` won't be surprised by a 1 minute timeout. For
instance, in the `temp_sensor.py` usage example I think it's reasonable
to expect the connection to the client to stay open indefinitely.

Author: rknegjens

micropython/bluetooth/aioble/aioble/device.py

@@ -215,7 +215,7 @@ def _run_task(self):
     async def disconnect(self, timeout_ms=2000):
         await self.disconnected(timeout_ms, disconnect=True)
 
-    async def disconnected(self, timeout_ms=60000, disconnect=False):
+    async def disconnected(self, timeout_ms=None, disconnect=False):
         if not self.is_connected():
             return